If you ever have the opportunity to experience a vacuum sack, I highly recommend it! My lovely friend J made a two-person vacuum sack, which is a divine experience for sure, but on this day my friend Mark from Serious Bondage got his chance to check out the new sack solo. Constructed with very soft and slippery chlorinated rubber, the sack fits everyone perfectly! After Mark slips into the sack, J zips up the air-tight zipper and switches on a small vacuum pump. This slowly vacuums out the air from inside of the sack, creating a blissful equal pressure all over Mark's body. Being a rubberist, Mark is wearing a thick rubber hood with a mouth-filling gag that allows for an inflatable gag to be shoved into his mouth and pumped up. Being a rubberist myself, I can not stop stroking Mark's body through the frictionless rubber - chlorinated rubber is truly divine! After I get Mark all sucked up, I begin to tease him with a vibrator. As he is helpless but can still wiggle, I am satisfied to see his rubber body squirm. If you are seeking a rubber vacuum sack experience, let me know ;)